The Dutchman told the Evening Chronicle: "I haven't spoken with Newcastle yet and I don't know what their plans are.
"But then again, I always want to make appearances, so I'd better stay with Falkirk and gain experience.
"For the time being, I keep all options open."
Krul has made 12 appearances for Falkirk, who are 10th in the league.
He says: "I have played a long series of matches in succession, which is very important for me."
Krul will be in goal against Rangers on Saturday and added: "These are hectic times but I hope to have my future sorted out soon."